After inclusion into the rigid channels of Zn MOF-74 crystals, molecules of spiroindolinobenzopyran (SPH) turned thermochromic by converting to its red merocyanine form on heating and reverse-photochromic by converting to its yellow spiro form under UV irradiation at 365 nm. However, SPH did not show any chromic reactivity in its pure solid form.
U. G. R. Lakmali and C. V. Hettiarachchi, CrystEngComm, 2015, 17, 8607 DOI: 10.1039/C5CE01639H
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